Patent GB-315662-A (GB)
Abstract: 315,662. National Cash Register Co., (Assignees of Shipley, B. M.). July 13, 1928, [Convention date]. Adding and subtracting apparatus; cash registers.-In machines having an adding and subtracting totalizer means are provided for automatically adding the " fugitive one " to obtain the true negative or positive balance and for compelling the operator to take the true balance total from the proper set of totalizer pinions. The addition of the " fugitive one " is accomplished through mechanism controlled by the totalizer element of highest denomination and adapted to operate a transfer mechanism associated with the element of lowest denomination. As shown applied to a cash register of the type described in Specification 8119/15 with three lines of totalizers the upper line supports a single adding and subtracting totalizer comprising pairs of geared pinions 104, 105, Figs. 1 and 13, slidably mounted on the shaft 106 under the control of a differential mechanism associated with the add and subtract keys 41, 42, Fig. 4, through a drum cam 122 and roller 121 on a rod 120 secured to an end frame carrying the shaft 106. The frame 112, 113 is slidable along a shaft 115 to position the pinions 104 or 105 in alignment with the amount differential actuator racks 64. Associated with the units bank differential member is a transfer mechanism of known form comprising, as shown in Figs. 1 and 3, pivoted transfer segment 125, a latch lever 127 pivoted thereto, a transfer stop arm, 129 pivoted to the stationary hanger 69, and a catch 136 secured to a stub shaft 139 to the other end of which is secured a trip pawl 140. This pawl is tripped during the passage of the highest denominational pinion from the 0 to 9 position so as to release the catch from the shoulder of the stop arm 129 and permit the stop arm to fall. The latch lever is thus given an additional movement to engage the' shoulder 134 of the stop arm, the segment 125 thereby forming an extension of the actuator rack 64 to give an additional step movement to the units pinion 104 or 105. For this purpose the highest order pinion 104 carries a sleeve 118, Figs. 8 and 13, having a control disc 116 with a trip tooth 117 adapted to be moved, by the usual totalizer-engaging mechanism, into co-operative relation with respect to one or other of the projections 180, 184 of a pair of spaced arms 164, 166 depending on the adjustment of the totalizer. The arms 164, 166 are mounted on the opposite ends of a stud 165 mounted on a flange of a slotted bracket 147. The arms are connected by a reversing gearing comprising gear wheels 167, 171, and wide pinions 169, 173 so arranged that when one arm is depressed the other is raised. If, after the negative pinions 105 have been moved into engagement with the racks, an amount is registered thereon greater than the amount standing on the positive pinions the positive pinions are turned backwardly through the zero position so that the tooth 117 depresses the arm 164 and a stud 163 rocks a bell-crank lever 161 to swing the projection 181 thereof past one or other of the pins 160 extending from opposite sides of an arm 159 on a shaft 151. The shaft 151 carries at its opposite end edjacent the units actuator an arm 150, Fig. 3, forked to embrace a pin 152 on a disc 145 with a tooth 144 which serves on the rocking of the shaft 151 to trip the pawl 140. A spring-pressed pawl 183 holds the bell-crank lever 161 in one or other of its adjusted positions. The shaft 151 is restored to normal by a spring 153, Fig. 3, the clockwise movement being limited by a stud 155. A driving segment co-operates with a spider member to effect the re-setting of the transfer parts by raising the stop bar 129 against its spring 133 to permit the stud 135 on the catch 136 to engage the shoulder 137 in the slot of the stop arm 129. Printing totals; keyboard interlocks.-In order to compel the operator to select the totalizer pinions upon which the true balance stands the add and subtract keys 41, 42, co-operate with a locking mechanism controlled by the total-taking lever 39, Fig. 2. By adjustment of the lever 39 a pinion 218 in the cam slot rocks a shaft 197 and causes an arm 196, Fig. 7, thereon to free a pin 212 on a link 195 from a notch in the hanger 89. At the same time a second pin 194 on the link 195 is moved into the vertical branch of an inverted T-shaped slot 193, Fig. 4, in an arm 192 of a locking sector 185 co-operating with the keys 41, 42. The pin 194 also projects through a slot in the arm 199 of a bell-crank lever 199, 200, the arm 200 of which is recessed at its free end to embrace a locking disc 215 pivoted on a stud 216 and provided with a cutaway portion adapted on the rocking of the disc to be presented to one or other of the prongs 213, 214 of the arm 200 to permit a movement thereof in one or other direction only. This mechanism determines which key 41 or 42 shall be depressed since pins 188, 190 on the key stems co-operate with oppositely disposed slopes 189, 191 on the sector to cause its movement in oppo- .site directions, that key only being operative which can effect the movement of the arm 200. The sector 185 normally occupies a neutral position by reason of its connection by springs 201, 202 with the arms 203, 211, of a bell-crank lever 204 and associated pins 205, 206. The position of the locking disc 215 is controlled by the rocking of the shaft 151, an arm 236, Figs. 4 and 5, of which has a pin 235 operatively engaging one or other of the projections 237, 238 of the disc 215 and a disc 226. These discs are connected by a reversing mechanism similar to that described above, comprising gears 221, 225 and wide pinions 222, 227 so arranged that as the pin 235 rocks one arm the other arm is rocked towards but out of the plane of the pin 235. A stud 240 on a spring-pressed pawl 241 holds the disc 226 in one or other of its adjusted positions. In adding and subtracting operations the arm 192 is permitted to rock in either direction without affecting the bell-crank lever 200 since the pin 104 lies normally in the horizontal part of the slot 193.